Which is a common psychological side effect of dementia?

A.optimism

B. loss of brain functionality

C. emotional distress

D.loss of coordination

In the given scenario, a piston-cylinder system receives 51 kJ of heat and loses 12 kJ. The system produces work, and To calculate work we can use W = Q - ΔU formula

The first law of thermodynamics states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system. Mathematically, this can be represented as:

ΔU = Q - W

Where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system.

In this case, the system receives 51 kJ of heat (Q = 51 kJ) and loses 12 kJ (Q = -12 kJ). We need to calculate the work done by the system (W).

Using the first law of thermodynamics equation, we can rearrange it to solve for W:

W = Q - ΔU

Since the change in internal energy (ΔU) is not given, we cannot directly calculate the work done. Additional information about the change in internal energy or any other relevant parameters would be required to determine the amount of work produced by the system.

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Answer:

dicot

Explanation:

I looked it up lmoooo

The liquid solvent used in chromatography is known as the mobile phase.

In chromatography, the liquid solvent used is known as the mobile phase. The mobile phase is a liquid or a mixture of liquids that carries the sample through the stationary phase. It plays a crucial role in separating the components of a mixture based on their different affinities for the stationary phase.

The choice of solvent in chromatography depends on various factors such as the nature of the sample, the type of chromatography being performed, and the desired separation. Commonly used liquid solvents include water, methanol, ethanol, acetonitrile, and hexane.

For example, in thin-layer chromatography (TLC), a common technique used in chemistry labs, the mobile phase is typically a mixture of a nonpolar solvent (such as hexane) and a polar solvent (such as ethyl acetate or methanol). This combination allows for the separation of different compounds based on their polarity.

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The liquid solvent used in chromatography is known as the mobile phase.

The answer provided is "mobile phase," which refers to the liquid solvent used in chromatography.

Chromatography is a technique used to separate and analyze the components of a mixture based on their differential affinities to a stationary phase and a mobile phase.

The mobile phase is the liquid or gas that carries the sample through the stationary phase.

In liquid chromatography, the mobile phase is typically a liquid solvent, such as a mixture of water and organic solvents.

The choice of mobile phase depends on the nature of the sample and the desired separation. Different solvents or solvent mixtures have varying polarities and elution strengths, allowing for selective separation of components.

The mobile phase moves through the stationary phase, which can be a solid adsorbent or a liquid-coated surface.

As the mobile phase passes through the stationary phase, the components of the sample interact differently with the stationary phase based on their chemical properties, resulting in separation.

Overall, the mobile phase plays a crucial role in chromatography by facilitating the movement and separation of sample components, allowing for their identification and analysis.

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Answer:

hope this is help helpful

Explanation:

natural gas are considered nonrenewable because they can not be replenished in a short period of time.

Answer:

I think B. force create matter is right one

Answer:

the answer is c

Explanation:

Crop rotation is the technique of planting crops in a different area of the garden so that no single crop will be planted in the same place two—or more—years in a row.

Crop rotation aids in preserving the structure and nutrient content of the soil as well as helping to keep pests that are carried by the soil from colonizing the garden.

As the same nutrients are repeatedly consumed when a single crop is planted in the same location each year, the soil structure slowly deteriorates. After a while, the soil loses those particular nutrients and becomes unhealthy. At the same time, insect pests that feed on a single crop and spend their larval stage in the soil multiply as long as their food supply is still present. As their number grows, these pests get harder to control every year.

There are four key benefits of crop rotation: (1) Plants that fix nitrogen, like legumes and peas, enhance the quality of the soil for subsequent vegetable plantings in the same bed. (2) Plants with shallow and deep roots alternately extracted nutrients from the soil at various depths. (3) Because their food source is not in the same place each year, soilborne pests that feed on a particular plant family are inhibited. (4) Farmers and gardeners that use crop rotation don't have to leave their fields or beds fallow as frequently as they might otherwise.

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An ionic equation is a chemical equation in which the electrolytes in aqueous solution are expressed as dissociated ions.

Given the molecular equation of the reaction of aqueous potassium sulfate, K2SO4, and aqueous strontium iodide, SrI2 as shown:

The total ionic equation is as shown below;

Next is to get the net ionic equation from the total ionic equation. Canceling out the common ions on both sides of the equation will give:

This gives the net ionic equation of the given molecular equation

The mass of 49.5 mL of silver can be calculated using the given density of silver as 10.49 kg/L.

To convert the volume from mL to L, we divide by 1000:

Volume of silver = 49.5 mL / 1000 = 0.0495 L

Next, we can use the density formula: density = mass / volume, to calculate the mass of silver:

mass = density * volume = 10.49 kg/L * 0.0495 L = 0.519855 kg

Since the question asks for the mass in grams, we can convert the mass from kilograms to grams by multiplying by 1000:

mass = 0.519855 kg * 1000 = 519.855 g

Therefore, the mass of 49.5 mL of silver is approximately 519.855 grams.

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Answer:

The chemical equation is;

Ca3(PO4)2 + 8C ———> Ca3P2 + 8CO

Explanation:

Here, we are interested in writing a chemical equation that is useful in the reduction of phosphorite.

We should understand that to be able to reduce phosphorite, there is need for a reducing agent.

Solid carbon can be used here.

The products formed are shown in the equation as follows;

Ca3(PO4)2 + 8C ———> Ca3P2 + 8CO

Explanation:

Potassium oxide is an ionic compound formed by combining potassium and oxygen. It carries the chemical formula K2O. Potassium cannot be found free because it is too reactive. It has valency +1 and combines readily with oxygen atoms forming K2O.

Answer:

The Correct answer is

K+O2------>K2O

balancing it will be

4K+O2----->2K2O

160 ml of a 4.0% (m/v) amino acid solution contains 6.4 g of amino acids.

We can use the idea of ​​percent concentration to determine how many grams of amino acids are present in 160 mL of a 4.0% (m/v) amino acid solution. Expressed by the mass percent concentration of the solute (amino acid) per 100 ml of solution. Since the solution in this example is 4.0% (m/v), 100 mL of solution contains 4.0 g of the amino acid.

We can make a ratio to determine how many grams are in 160 ml:

4.0 grams / 100 ml = x grams / 160 ml

When we cross multiply for x, we get:

x = (4.0 grams / 100 ml) * 160 ml

x = (0.04) * 160

x = 6.4 grams

Consequently, 160 mL of a 4.0% (m/v) amino acid solution contains 6.4 g of amino acids.

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The reactivity and structure of a monomer determine if it undergoes free radical, cationic, or anionic polymerization.

The reactivity and structure of a monomer determine the polymerization method it will undergo.

For example, monomers with carbon-carbon double bonds typically undergo free radical polymerization, while monomers with polar groups or carbocations undergo cationic polymerization, and monomers with anions or nucleophilic groups undergo anionic polymerization.

In free radical polymerization, monomers like styrene with a double bond undergo chain growth through initiation, propagation, and termination steps.

In cationic polymerization, monomers like vinyl ethers undergo chain growth by the attack of a carbocation on the monomer.

In anionic polymerization, monomers like butadiene undergo chain growth through the attack of a nucleophile or anion on the monomer.

The choice of polymerization method depends on the monomer's structure, reactivity, and desired polymer properties. Factors such as monomer stability, reactivity, and the presence of functional groups influence the selection of the appropriate polymerization method.

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Answer:

The north atlantic contains the warmest and saltiest water of the major oceans, the southern ocean is the coldest, the north pacific has the lowest average salinity. This density signature is locked into the water parcel when it sinks

Explanation:

i think

The molarity of the analyte is 1.40 M and the pKa of the analyte in this titration is 5.5 to the nearest 0.5.

a. The formula used to calculate the molarity of analyte is given as:

Molarity of Analyte = (Molarity of Titrant * Volume of Titrant) / Volume of Analyte

Here, the volume of titrant is unknown. However, the volume of analyte is given as 30.00 mL. Thus, we can rearrange the formula as follows:

Volume of Titrant = (Molarity of Analyte * Volume of Analyte) / Molarity of Titrant

Volume of Titrant = (1.40 M * 30.00 mL) / 0.1750 M

Volume of Titrant = 240 mL

Therefore, the molarity of the analyte is 1.40 M.

b. The Henderson-Hasselbalch equation is given by:

pH = pKa + log([A-] / [HA])

where [A-] and [HA] are the concentrations of the weak base and weak acid forms, respectively.

At the half-equivalence point, the pH is equal to the pKa of the analyte. Therefore, we can substitute the values into the equation:

pKa = pH - log([A-] / [HA])

pKa = 5.5 - log(1) = 5.5

Therefore, the pKa of the analyte in this titration is 5.5 to the nearest 0.5.

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The maximum mass of aluminum chloride that can be produced from 31.0 g of aluminum is 153.0 g.

Aluminium chloride, is used to treat excessive perspiration. If you have any questions, speak with your doctor or pharmacist. This medication may also be used for other conditions.

convert the given masses of aluminum and chlorine to moles:

Aluminum: 31.0 g / 26.98 g/mol = 1.15 mol

Chlorine: 36.0 g / 70.906 g/mol = 0.508 mol

Since there are three moles of chlorine for every two moles of aluminum in the reaction, we can determine which reactant will limit the reaction. In this case, it is the chlorine, as it is present in a smaller amount. Therefore, the maximum amount of aluminum chloride that can be formed is equal to 0.508 mol, or:

Aluminum chloride: 0.508 mol * 133.34 g/mol = 67.7 g

If you had excess chlorine, you would be able to produce more aluminum chloride, up to the limit set by the amount of aluminum present. So, if you had unlimited amounts of chlorine, the maximum mass of aluminum chloride that could be produced from 31.0 g of aluminum would be:

Aluminum chloride: 1.15 mol * 133.34 g/mol = 153.0 g

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Explanation:

Correct option is

D

3

The unbalanced chemical reaction is Al(s)+O

2

(g)→Al

2

O

3

(s)

Balance Al atoms by adding 2 to Al on LHS

2Al(s)+O

2

(g)→Al

2

O

3

(s)

Balance O atoms by adding

2

3

to O

2

on LHS

2Al(s)+

2

3

O

2

(g)→Al

2

O

3

(s)

Multiply the whole equation with 2.

4Al(s)+3O

2

(g)→2Al

2

O

3

(s)

This is the balanced chemical equation. The coefficient of O

2

is 3.

Answer:PV=nRT ideal gas law

P presdure

V volume

n number of moles of gas

R gas constant

T temperature

Explanation: V=nRT/P

2liters=nR300k/P

divide by 2 for the equation

1liters=nR150k/P

with nR remaining constant

Answer:

the amount of matter it contain

Sulfur dioxide is one air pollutant released from the combustion of coal.

When coal is burned for energy production, it releases various pollutants into the atmosphere, and one of the primary pollutants is sulfur dioxide (SO2). Coal often contains sulfur compounds, and during combustion, these compounds are oxidized, producing SO2. This pollutant is a significant contributor to air pollution and has detrimental effects on both human health and the environment.

Sulfur dioxide emissions from coal combustion contribute to the formation of acid rain, which damages ecosystems and harms aquatic life. Moreover, SO2 is a respiratory irritant and can cause or worsen respiratory diseases, such as asthma and bronchitis, in humans. The release of sulfur dioxide can also lead to the formation of fine particulate matter (PM2.5) and contribute to the overall air quality degradation. To mitigate the harmful effects of coal combustion, it is essential to employ pollution control technologies, such as flue gas desulfurization systems, to reduce sulfur dioxide emissions and promote cleaner and more sustainable energy sources.

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Answer:

Lithosphere

Explanation:

Answer:

Lithosphere

Explanation:

The Lithosphere is the outermost layer of the Earth of about 100km thick and it is a rigid layer that includes the brittle upper portion of the mantle and the crust. Lithosphere is the hard outer region which includes all of the crust and the uppermost mantle.

Answer:

Brass and bronze are both metal alloys, which means they are a combination of two or more different metals. Brass is composed of copper and zinc, whereas bronze is made up of copper and tin, sometimes with other elements such as phosphorus or aluminium added in.

Answer:

Both brass and bronze are metal alloys, which are made up of two or more distinct metals. Brass is comprised of copper and zinc, while bronze is formed of copper and tin, with the addition of phosphorous or aluminum.

Explanation:

Hope it helps;)

Explanation:

physical changes : boiling water, freezing water, a pencil being sharpened.

chemical change : rotting cheese, exploding dynamite.

Answer:

boiling water

a pencil being sharpened

freezing water

Explanation:

A change that does not lead to any difference in chemical composition of a substance is known as a physical change.

For example, shape, size, mass, volume, density, boiling point, etc of a substance are all physical properties.

On the other hand, changes that lead to bring change in chemical composition of a substance is known as a chemical change.

For example, exploding dynamite, rotting cheese etc are all chemical changes.

Chemical change is the change in which there is rearrangement of atoms and the new substances get formed.

Boiling water only changes the phase from liquid to gas and thus is a physical change.

Pencil on being sharpened only gets smaller in size and thus is a physical change.

exploding dynamite would result into formation of new substances and hence a chemical change.

Freezing water only changes the phase from liquid to solid and thus is a physical change.

Rotting cheese would result in formation of new substances and hence a chemical change.

Therefore, we can conclude that following are the physical changes in matter.

boiling water.

a pencil being sharpened.

freezing water.

Step 1

a. Please look at the next drawing:

First compound: C2H4

H = enthalphy = energy

H(C2H4) = H(C=C) + 4 x H(C-H) = 358 + 4 x 413 = 2010

------

Second compound: F2

H(F-F) = 154

------

Third compound: C2H4F2

H(C2H4F2) = 2 x H(C-F) + 4 x H(C-H) + H(C-C) = 2 x 485 + 4 x 413 + 495 = 3117

Therefore, ΔH = H products - H reactants = 3117 - (2010 + 154) = 953

Answer: ΔH = 953

Catalysts are correctly characterized by each of the following statements except one. Catalysts are characterized by being able to exist in various states (solids, liquids, or gases),
The correct answer is (e) no correct response.

All of the statements are correct and accurately describe catalysts.
(a) Catalysts can exist in any state, whether they are solids, liquids or gases.
(b) One of the primary functions of a catalyst is to lower the activation energy required for a reaction to occur. This allows the reaction to proceed more quickly and efficiently.
(c) Catalysts do not participate in the reaction itself, but rather facilitate it.
(d) Catalysts are not consumed during a reaction and can be reused multiple times.

Catalysts are characterized by being able to exist in various states (solids, liquids, or gases), lowering the activation energy for a reaction, and not being consumed in a reaction. However, they do actively participate in a reaction by providing an alternative reaction pathway and forming temporary intermediate compounds, which ultimately helps increase the reaction rate.

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Iron III oxide and lead II oxide

They are both ionic

Oxides are a class of chemical compounds that contain one or more oxygen atoms combined with other elements. They can be formed by the combination of oxygen with most elements in the periodic table, including metals, nonmetals, and metalloids.

Oxides are important in many industrial and technological applications. For example, metal oxides are commonly used as catalysts, pigments, and in the production of ceramics, while nonmetal oxides are used in the production of acids and inorganic salts.

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Answer: They are the same

Explanation:

According to the law of conservation of mass, in a chemical reaction, the amount of matter in the reactants is the same as that of the products. Matter is neither created nor destroyed, thus the mass would, in turn, remain the same.

Answer:

Improving the habitats of herring thereby increasing their population.

Explanation:

First, two consumers (Steller sea lion and  Pollock) are both competing for common prey (herring). Since the question only asked what could be done to increase the decreasing Steller sea lion population of Alaska, the focus would be made only on the Steller sea lion.

The Steller sea lion population would increase if:

1. The herring population should be increased by improving the food available for them to feed on, and improving their reproduction capacities to enable them to reproduce efficiently.

2. Since there are 2 predators. If the population of the prey is fixed, then Pollock should be more hunted by farmers or other biological means to eliminate competition.

Answer:

because is made of more than on type of atom